If you prefer not to use third-party tools, some users have reported success with this manual method for KG State: Prenormal:
He laughed out loud. Then he read the final message from Robytech7z: all samsung kg lock fix by robytech7z link
RobyTech7z appears to be a developer or technician who has created tools and methods for bypassing Samsung KG Lock across various device models. The phrase "all samsung" suggests their solution aims for broad compatibility—working on Galaxy S series, Note series, A series, and even tablets. If you prefer not to use third-party tools,
Launch the specific tool provided in the link. Launch the specific tool provided in the link
For any technician, hobbyist, or second-hand phone buyer, encountering a Samsung smartphone locked by Knox Guard (KG) is a familiar yet formidable challenge. This aggressive security feature is designed by Samsung to prevent unauthorized modifications and deter theft, but it is most famously known for blocking devices that were purchased on installment plans and then not fully paid off. Regardless of the reason, a device displaying a "KG State: Locked" status in Download Mode has its bootloader locked and its functionality severely crippled. You may be able to turn it on, but activating the phone or attempting to flash custom ROMs becomes an impossible task.
If you want, I can:
The phone rebooted. For ten seconds — nothing. Then the setup wizard appeared. No KG lock. No warning. Just pure Android freedom.